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I don’t know much about its provenance, but this small python program is just the thing if you’re trying to export a large Excel spreadsheet to a far more usable/malleable CSV file. Particularly useful for folks with Macs, since Numbers, Libre Office, and Open Office don’t handle large files well (Numbers and Open Office couldn’t open the file, and Libre Office opened the file, it couldn’t muster the energy to save it in another format)